The core elements of UI design (User Interface design) in software applications include layout, visual hierarchy, and interactivity. An effective layout organizes information logically to enhance user experience. Visual hierarchy guides users through essential elements, utilizing size, color, and spacing to prioritize content. Interactivity elements, such as buttons, sliders, and menus, must be intuitive and responsive to ensure smooth user navigation. Consistency across the interface promotes familiarity, while accessibility features cater to diverse user needs. Ultimately, these elements work together to create a user-friendly interface that enhances overall engagement.